Vibratory screen



g 1937- c. c. FERRISS, sR 2,091,503

I VIBRATORY SCREEN Filed July 23, 1934 2 Sheets-Sheet l 0n 0000000n000000 m 0 0 0 0 0 0 0 n 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C C 0 c 0 0 \a\,\

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. VIBRATORY SCREEN Filed July 25, 1934 2 Sheets-Sheet 2 Patented Aug.31, 1937 VIBRATORY SCREEN 7 Charles Clinton Ferriss, Sr., Chico, Tex.

Application July 23,

Claims.

This invention relates to a device for screening rocks, gravel, andother material, and has more particular reference to an improvedscreening de vice of the vibratory type wherein a screen carrying frameis resiliently supported, and wherein means is provided for vibratingthe screen carrying frame including a rotatable shaft journaled on thescreen carrying frame and provided with unbalanced or eccentricallyweighted rotors rotatable with the shaft at high speed.

'20 secure a most efficient screening operation.

The present invention also consists in certain other features ofconstruction, and in the novel combination and arrangement of theseveral parts, as hereinafter fully described, illustrated in theaccompanying drawings, and claimed.

In the drawings: Figure 1 is a top plan View, partly broken away, of ascreening device constructed in accordance with the present invention. 7

Figure 2 is a side elevational view thereof, partly broken away. Figure3 is a transverse section on line 33 of Figure 2; and

Figure 4 is a sectional detail view showing the construction of one ofthe unbalanced or eccentrically weighted rotors.

Referring in detail to the drawings, the illustrated embodiment of theinvention consists of a base frame 5, a screen carrying frame 6,elliptical springs 1 supporting the screen carrying frame 6 on the baseframe 5, and means including a driven shaft 8 provided with unbalancedor eccentrically weighted rotors 9 and journaled on and transversely ofthe screen carrying frame 6 for 45 vibrating the latter relative to thebase frame 5. The springs are located at opposite sides of the screencarrying frame 6 at each end of the latter and are restrained againstlateral swaying movement by guide plates 1 0 so as to restrain thescreen carrying frame 6 against lateral swinging or tilting movement.

The frame 6 is open at one end and closed by a wall II at its other end,and embodies spaced 55 side walls rigidly connected at intervals bytrans- 1934, Serial No. 736,585

verse brace and spreader bolts l2. Secured on the inner faces of theside walls of frame 6 are opposed pairs of angle iron supports l3 uponwhich are arranged an upper screen l4 and a lower screen l5 of eitherperforated plate or wire mesh type reinforced at the sides by means ofan angle iron l6 and a clamping bar I! between which the side margins ofthe screen are bolted. By reason of this construction, the screens arereadily removable for renewal or repair, and it is obvious that eitherone or both of the screens may be employed as found necessary ordesirable. When both screens are used, the top screen may be of widermesh than the lower screen so that when the screen carrying frame isvibrated the material will be moved and screened so that the largeparticles will drop off the top screen at the at the open lower end offrame 6, the still smaller particles will pass through the top screenand be caught'by the lower screen,the particles too large topass'through the lower screen travelling along the same and dropping offthe lower end thereof at the open lower end of frames 6, the stillsmaller particles which pass through the lower screen being disposed ofin any suitable manner. This operation is useful when it is desired toscreen the material or grade the .same into three different sizes, whileonly one screen will be used when grading in two sizes is desired.

The base frame 5 consists of rigidly connected side rails upon which arebolted inwardly projecting hanger plates .18 upon the projecting innerportions of which the springs l are bolted and clampedas at 19. Theguide plates ID are flanged and bolted at their lower ends to the hangerplates l8 at the inner sides of the springs 1 as shown clearly in Figure3, and fastened on the outer faces of the side walls of frame 6 areangular hanger plates having outwardly projecting upper ends which bearupon the upper portions of .the springs 1 and are bolted and clampedthereto as at 21. In this'way the screen carrying frame 6 is resilientlysupported for vibration relative to the base frame-5. An angular coveror shield .22 is preferably provided for each of the springs 1,.sa'idcovers or shields being bolted at their outwardly flanged lower endsupon the side rails of base frame .5.

. The driven shaft 8 is journaled in roller bearings provided within theenlarged ends 22 of a.

tubular shaft .housing '23 mounted transversely of anddirectly above thescreen carrying frame ,6 intermediate the ends of the latter. As shown,

the ends'of housing 23 are provided with annular flanges 24 bolted tothe inner faces of bracket plates 25 rigidly fastened to and projectingabove the side walls of screen carrying frame 6. The bracket plates 25have openings alined with shaft 8 and outwardly through which the endsof said 5 shaft 8 project, the unbalanced or eccentrically weightedrotors 9 being secured upon such projecting ends of shaft 8 at the outersides of frame 6. The rotors 9 are preferably in the form ofdiametrically split or divided pulleys bolted upon 10 the ends of shaft8 asat 25, one section of each pulley being of solid or weightedconstruction, and the other section thereof being of unweighted webbedor hollow construction. either one of the eccentrically weighted pulleysor rotors 9 may be utilized as a part of a means for rotating shaft 8and said eccentrically weighted pulleys or rotors for impartingvibratory motion to screen carrying frame'B. As shown, a high speedelectric motor 21 may be mounted upon a fixed or stationary support 28at one side of and adjacent one end of the screen, said motor 21 havinga pulley 29 on the armature shaft thereof connected 'by a belt 30 withthe rotor or pulley ,9 located at the same side of the screen. Inpractice, the device is mounted at an angle or inclination, and thematerial to be screened is deposited on the screen proper at the highclosed end of screen frame'6. Due to the form and arrangement of springsI and the use of guide plates H] to prevent lateral swaying of'saidsprings, the vibrating action of screen carrying frame 6 is differentfrom that attained in prior screening devices. The frame 6 is vibratedin a vertically elongated orbital or elliptical path whose major'axis isinclined at an angle between horizontal and vertical and upwardly towardthe higher feed end of the screen. This causes the material to be thrownup toward the feed end of the screen as it slides down along the latter,in addition to eddying around on the screen. Thus, the screeningoperation is made most efficient, and ordinarily the finer particleshave passed through the screen proper before the material hastravelled'half the length of the screen proper. This speeds up thescreening operation as well as promoting the efficiency'thereof, bymaking it practical to set the screening device at a decidedinclination. The particular operation described is believed to be theresult of the kind and arrangement of the springs 1 and the use of theguide plates ID, in addition to the restraining influence of belt 30upon tendency of the screen carrying frame to shift longitudinally inone 55 direction while being vibrated.

It will be particularly noted that the means for vibrating the screencarrying frame is very simple and durable in construction and providesfor driving the shaft 8 at either side of the ap- 60 paratus.

From the foregoing description, it is believed that the advantages andnovel features of the invention will be readily apparent. Changes in thespecific details of construction illustrated and 65 described arecontemplated within the spirit and scope of the invention as claimed.

What I claim asnew is: V

1. In a screening apparatus, the combination of an inclined screencarrying frame and'revolu- 70 ble weighted means thereon for impartingvibratory movement to said frame in a vertically elongated ellipticalpath whose major axis is inclined upwardly toward the higher feed end ofthe In this way,

screen, a base, elliptical springs mounting said frame upon said basefor such vibratory movement, said elliptical springs beinglongitudinally disposed at opposite sides of the frame at each endthereof, and means for guiding said springs when flexed while the frameis vibrated to prevent lateral movement of said frame, and belt drivingmeans for said revoluble weighted means restraining said screen carryingframe from longitudinal shifting in the direction of its higher end,whereby the material being screened is thrown up toward the higher feedend of the screen as it slides down the latter and is also caused toeddy around on the screen.

2.A screening apparatus including a base, an inclined screen framedisposed above the base, elliptical springs resiliently supporting thescreen frame above the base, said springs being disposed at oppositesides of the screen frame at each end of the latter, belt drivenrevoluble weighted means for vibrating said screen frame in a verticallyelongated elliptical path having its major axis inclined at an anglebetween the vertical and the horizontal, and upwardly toward the higherend of the screen frame and means for guiding said springs when flexedwhile the screen frame is vibrated to prevent lateral movement of saidframe.

3. A screening apparatus including a base, an inclined screen framedisposed above the base, elliptical springs resiliently supporting theframe above the base, said springs being disposed at opposite sides ofthe frame at each end of the latter, belt driven revoluble weightedmeans for vibrating said frame in a vertically elongated elliptical pathhaving its major axis inclined at an angle between the vertical and thehorizontal and toward the higher end of the screen frame, and guidingmeans for said springs to prevent lateral swaying of said frame.

4. A screening apparatus including a base, an inclined screen framedisposed above the base, elliptical springs resiliently supporting theframe above the base, said springs being disposed at opposite sides ofthe frame at each end of the latter, belt-driven revoluble weightedmeans for Vibrating said frame in a vertically elongated elliptical pathhaving its major axis inclined at an angle between the vertical and thehorizontal and toward the higher end of the screen frame, and angularcovers for said springs mounted upon the base and disposed at the outersides of and over tops of said springs, said covers cooperating withsaid springs to prevent lateral swaying of said screen frame.

5. A screening apparatus comprising a base, an inclined screencarrying'frame, resilient means supporting said frame above said basefor free vertical and limited longitudinal vibration, means operativelyassociated with said resilient means,

to restrain said frame against lateral swaying and tilting movement, andbelt-driven revoluble weighted means on said frame for impartingvibratory movement tothe latter in an elongated path whose major axislies in a plane inclined between planes parallel with and perpendiculardisposed longitudinally at opposite sides of the.

frame at each end of the latter.

CHARLES CLINTON FERRISS, SR.

